It's running 1.03c right ?
If it's running 2.x then there are issues with that on various Falcons.
Fujiyama wrote:EDIT: it looks like I might have mixed up the wire colours. I'm doing a double-check now, but feel free to comment the above.
Fujiyama wrote:There was some talk about USB up-/downstream a while back, and incompatibilities with certain USB hubs. Not sure about the details, but this was straightened out with later versions of the Unicorn which had some additional circuitry to resolve this, wasn't it?